Water-expandable flexible flame-retardant foam plastic and preparation method thereof

A foam plastic and water-swelling technology, which is applied in the field of polyurethane foam plastics, can solve the problems of water retention performance decline, low water absorption expansion rate, flammability and non-self-extinguishing, etc., to achieve enhanced water retention capacity, stable water absorption performance, and physical and mechanical properties. small effect

Active Publication Date: 2019-11-08
中电保力(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies in the prior art that polyurethane foam plastics are flammable and not self-extinguishing, as water-absorbing foams, they have low water absorption expansion rate, poor resilience, and decline in water absorption and water retention after repeated soaking. Reusable, high resilience, high water expansion rate, damage resistance, intrinsically flame-retardant polyurethane foam plastics, and a preparation method for said foam plastics

Method used

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  • Water-expandable flexible flame-retardant foam plastic and preparation method thereof
  • Water-expandable flexible flame-retardant foam plastic and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0047] Preparation example 1 polyvinyl alcohol / isocyanate silane coupling agent graft copolymer

[0048] Add 106.6g of polyvinyl alcohol with a molecular weight of 25,000 and an alcoholysis degree of 70% to the reaction kettle, vacuum dehydrate it at 20°C for 2 hours, cool down the polyvinyl alcohol to 60°C, and add the polyvinyl alcohol that has been preheated at 60°C to the above system Prepare 40g of 3-isocyanatopropyltrimethoxysilane, 200g of DMSO, fully react at 60°C for 4 hours under temperature control, vacuum filter and dry to obtain the grafted crude product, and extract the crude product with acetone for 48 hours to remove unreacted small molecules , the insoluble matter was dried in a vacuum oven at 60° C. to a constant weight of 130 g to obtain a polyvinyl alcohol / isocyanate silane coupling agent graft copolymer with a graft rate of 18%.

[0049] According to the similar method, the ratio of raw materials and the reaction time can be adjusted to obtain different ...

preparation example 2

[0050] Preparation Example 2 Preparation of Modified Flame Retardant

[0051] The preparation method of modified flame retardant comprises the steps:

[0052] 1) Put 20 parts of aluminum hydroxide into a drying oven, dry at 120°C for 3 hours, and cool the dried flame retardant to room temperature for later use;

[0053] 2) Weigh the aluminum hydroxide obtained in step 1) and add it to a high-speed mixer, keep the temperature at 60°C, continue stirring, spray 1.5% 4,4'-diphenylmethane diisocyanate on the flame retardant, and stop after 10 minutes Stir and heat to obtain the modified flame retardant.

Embodiment 1

[0054] Example 1 Preparation of water-swellable flexible flame-retardant foam

[0055] A water-swellable flexible foam plastics, comprising the following raw materials in parts by weight: 40 parts of polyethylene oxide glycerol with an average relative molecular weight of 5500, 5 parts of polyvinyl alcohol / silane coupling agent graft copolymer, 60 parts of toluene -2,4-diisocyanate, 3 parts of Momentive L-6188 cell opener, 1 part of Momentive silicone oil L580 foam stabilizer, 15 parts of compound foaming agent composed of water and pentane, wherein the mixture of water and pentane The ratio is 6:1, 20 parts of 3-isocyanate propyltriethoxysilane modified aluminum hydroxide, 3 parts of dibutyltin dilaurate.

[0056] The preparation steps are:

[0057] 1) Add Momentive silicone oil L580 foam stabilizer, Momentive L-6188 cell opener, and 3-isocyanate propyltriethoxysilane modified aluminum hydroxide in the above raw materials into the high-speed mixer, and mix until Uniform; ...

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Abstract

The invention relates to water-expandable flexible flame-retardant foam plastic. The water-expandable flexible flame-retardant foam plastic is prepared from the following raw materials in parts by weight: 40-60 parts of a polyester polyol and/or a polyether polyol, 5-10 parts of s graft copolymer of polyvinyl alcohol/an isocyanate group silane coupling agent, 50-90 parts of a polyisocyanate, 1-5 parts of an opening agent, 0.2-3 parts of a foam stabilizer, 5-20 parts of a compound foaming agent, 10-30 parts of a modified flame retardant and 0.2-1 part of a catalyst. The invention simultaneouslyfurther provides a preparation method of the water-expandable flexible flame-retardant foam plastic. According to the prepared water-expandable flexible flame-retardant foam plastic, the graft copolymer of the polyvinyl alcohol/the silane coupling agent is introduced on a polyurethane foam skeleton, unexpectedly it is found that the water absorption capacity and the water retaining capacity of obtained polyurethane foam are enhanced, thus the prepared foam plastic has better water absorption expansion rate and rebound resilience, and the application field of polyester foam is widened; and theflame retardant reacts to a skeleton molecule, intrinsic flame-retardant foam plastic is formed, migration and precipitation of the flame retardant are avoided, so that the flame retardant effect lasts longer, and the effect on the physical and mechanical properties of a material is less.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam plastics, in particular to a water-swellable flexible foam plastic and a preparation method thereof. Background technique [0002] At present, there are two main types of cable waterproof sealing technology, one is mechanical sealing devices, such as cable flange flexible sealing devices or inflatable devices, and the other is sealing materials, such as quick-drying cement and water-swellable rubber. [0003] However, these two plugging technologies have the following disadvantages: 1. The disassembly and assembly operations are complicated, and they cannot adapt to the complex and changeable cable crossing environment (such as eccentric cables or multi-strand cables); 2. There is a risk of leakage due to external forces, and the There is a risk of permanently losing the sealing effect after the external force is applied; 3. The construction environment temperature, humidity, and the sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/42C08G18/62C08K9/06C08K3/22C08J9/14C08J9/08
CPCC08G18/42C08G18/4829C08G18/6212C08G18/7614C08J9/009C08J9/08C08J9/141C08J2203/184C08J2205/05C08J2375/08
Inventor 袁振王少华王宇川
Owner 中电保力(北京)科技有限公司
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